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Mihaela Ligia Ungureşan, G. Niac, Investigation of Cu2+ – S2O32- Reaction Kinetics

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Mihaela Ligia Unguresan, G. Niac

Editorial: ISSN: 1028-6624, Inorganic Reaction Mechanisms, vol.6, Issue 3, p.239 -24, 2007.


The kinetics of reaction between copper(II) and thiosulfate ions and formation of an intermediate complex, CuS2O3, are investigated.
The kinetics of fading away of the color of this complex has been traced spectrophotometrically using a stopped-flow apparatus. The experimental reaction order (between 2 and 2.5) shows that the mechanism involving in the first step complex’s fast formation and in the second, the reaction between two complex molecules.
The temperature’s influence on the reaction kinetics has been studied and the reaction’s global activation energy was also calculated. The obtained value of this reaction’s activation energy is Ea = 12.8 kJ/mol.

Cuvinte cheie: Preequilibrium kinetics, Fast redox reaction, Copper ions, Thiocompounds, Stopped-flow method, Activation energy